Article I — The Legislative Branch
Establishes Congress (Senate and House of Representatives), qualifications for members, legislative procedures, enumerated powers (taxation, commerce, coining money, declaring war), and limitations on federal and state powers.
Article II — The Executive Branch
Establishes the Presidency, the Electoral College, presidential powers (Commander-in-Chief, treaties, appointments), executive duties, and grounds for impeachment.
Article III — The Judicial Branch
Establishes the Supreme Court, authorizes lower federal courts, defines federal court jurisdiction, and outlines rules regarding treason.